Mercurial > hg > graal-compiler
annotate src/share/vm/oops/method.cpp @ 6885:685df3c6f84b
7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair
author | jmasa |
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date | Tue, 18 Sep 2012 23:35:42 -0700 |
parents | d804e148cff8 |
children | a3ecd773a7b9 4735d2c84362 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "code/debugInfoRec.hpp" | |
28 #include "gc_interface/collectedHeap.inline.hpp" | |
29 #include "interpreter/bytecodeStream.hpp" | |
30 #include "interpreter/bytecodeTracer.hpp" | |
31 #include "interpreter/bytecodes.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/oopMapCache.hpp" | |
34 #include "memory/gcLocker.hpp" | |
35 #include "memory/generation.hpp" | |
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36 #include "memory/metadataFactory.hpp" |
1972 | 37 #include "memory/oopFactory.hpp" |
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38 #include "oops/methodData.hpp" |
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39 #include "oops/method.hpp" |
1972 | 40 #include "oops/oop.inline.hpp" |
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41 #include "oops/symbol.hpp" |
1972 | 42 #include "prims/jvmtiExport.hpp" |
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43 #include "prims/jvmtiRedefineClasses.hpp" |
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44 #include "prims/methodHandles.hpp" |
1972 | 45 #include "prims/nativeLookup.hpp" |
46 #include "runtime/arguments.hpp" | |
47 #include "runtime/compilationPolicy.hpp" | |
48 #include "runtime/frame.inline.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/relocator.hpp" | |
51 #include "runtime/sharedRuntime.hpp" | |
52 #include "runtime/signature.hpp" | |
3779 | 53 #include "utilities/quickSort.hpp" |
1972 | 54 #include "utilities/xmlstream.hpp" |
0 | 55 |
56 | |
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57 // Implementation of Method |
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58 |
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59 Method* Method::allocate(ClassLoaderData* loader_data, |
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60 int byte_code_size, |
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61 AccessFlags access_flags, |
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62 int compressed_line_number_size, |
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63 int localvariable_table_length, |
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64 int exception_table_length, |
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65 int checked_exceptions_length, |
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66 TRAPS) { |
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67 assert(!access_flags.is_native() || byte_code_size == 0, |
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68 "native methods should not contain byte codes"); |
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69 ConstMethod* cm = ConstMethod::allocate(loader_data, |
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70 byte_code_size, |
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71 compressed_line_number_size, |
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72 localvariable_table_length, |
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73 exception_table_length, |
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74 checked_exceptions_length, |
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75 CHECK_NULL); |
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76 |
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77 int size = Method::size(access_flags.is_native()); |
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78 |
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79 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size); |
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80 } |
0 | 81 |
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82 Method::Method(ConstMethod* xconst, |
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83 AccessFlags access_flags, int size) { |
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84 No_Safepoint_Verifier no_safepoint; |
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85 set_constMethod(xconst); |
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86 set_access_flags(access_flags); |
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87 set_method_size(size); |
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88 set_name_index(0); |
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89 set_signature_index(0); |
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90 #ifdef CC_INTERP |
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91 set_result_index(T_VOID); |
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92 #endif |
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93 set_constants(NULL); |
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94 set_max_stack(0); |
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95 set_max_locals(0); |
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96 set_intrinsic_id(vmIntrinsics::_none); |
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97 set_jfr_towrite(false); |
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98 set_method_data(NULL); |
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99 set_interpreter_throwout_count(0); |
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100 set_vtable_index(Method::garbage_vtable_index); |
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101 |
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102 // Fix and bury in Method* |
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103 set_interpreter_entry(NULL); // sets i2i entry and from_int |
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104 set_adapter_entry(NULL); |
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105 clear_code(); // from_c/from_i get set to c2i/i2i |
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106 |
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107 if (access_flags.is_native()) { |
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108 clear_native_function(); |
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109 set_signature_handler(NULL); |
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110 } |
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111 |
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112 NOT_PRODUCT(set_compiled_invocation_count(0);) |
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113 set_interpreter_invocation_count(0); |
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114 invocation_counter()->init(); |
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115 backedge_counter()->init(); |
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116 clear_number_of_breakpoints(); |
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117 |
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118 #ifdef TIERED |
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119 set_rate(0); |
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120 set_prev_event_count(0); |
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121 set_prev_time(0); |
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122 #endif |
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123 } |
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124 |
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125 // Release Method*. The nmethod will be gone when we get here because |
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126 // we've walked the code cache. |
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127 void Method::deallocate_contents(ClassLoaderData* loader_data) { |
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128 MetadataFactory::free_metadata(loader_data, constMethod()); |
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129 set_constMethod(NULL); |
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130 MetadataFactory::free_metadata(loader_data, method_data()); |
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131 set_method_data(NULL); |
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132 // The nmethod will be gone when we get here. |
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133 if (code() != NULL) _code = NULL; |
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134 } |
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135 |
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136 address Method::get_i2c_entry() { |
0 | 137 assert(_adapter != NULL, "must have"); |
138 return _adapter->get_i2c_entry(); | |
139 } | |
140 | |
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141 address Method::get_c2i_entry() { |
0 | 142 assert(_adapter != NULL, "must have"); |
143 return _adapter->get_c2i_entry(); | |
144 } | |
145 | |
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146 address Method::get_c2i_unverified_entry() { |
0 | 147 assert(_adapter != NULL, "must have"); |
148 return _adapter->get_c2i_unverified_entry(); | |
149 } | |
150 | |
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151 char* Method::name_and_sig_as_C_string() const { |
0 | 152 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature()); |
153 } | |
154 | |
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155 char* Method::name_and_sig_as_C_string(char* buf, int size) const { |
0 | 156 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size); |
157 } | |
158 | |
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159 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { |
0 | 160 const char* klass_name = klass->external_name(); |
161 int klass_name_len = (int)strlen(klass_name); | |
162 int method_name_len = method_name->utf8_length(); | |
163 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
164 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
165 strcpy(dest, klass_name); | |
166 dest[klass_name_len] = '.'; | |
167 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
168 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
169 dest[len] = 0; | |
170 return dest; | |
171 } | |
172 | |
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173 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { |
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174 Symbol* klass_name = klass->name(); |
0 | 175 klass_name->as_klass_external_name(buf, size); |
176 int len = (int)strlen(buf); | |
177 | |
178 if (len < size - 1) { | |
179 buf[len++] = '.'; | |
180 | |
181 method_name->as_C_string(&(buf[len]), size - len); | |
182 len = (int)strlen(buf); | |
183 | |
184 signature->as_C_string(&(buf[len]), size - len); | |
185 } | |
186 | |
187 return buf; | |
188 } | |
189 | |
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190 int Method::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) { |
0 | 191 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) |
192 // access exception table | |
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193 ExceptionTable table(this); |
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194 int length = table.length(); |
0 | 195 // iterate through all entries sequentially |
196 constantPoolHandle pool(THREAD, constants()); | |
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197 for (int i = 0; i < length; i ++) { |
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198 //reacquire the table in case a GC happened |
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199 ExceptionTable table(this); |
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200 int beg_bci = table.start_pc(i); |
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201 int end_bci = table.end_pc(i); |
0 | 202 assert(beg_bci <= end_bci, "inconsistent exception table"); |
203 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
204 // exception handler bci range covers throw_bci => investigate further | |
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205 int handler_bci = table.handler_pc(i); |
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206 int klass_index = table.catch_type_index(i); |
0 | 207 if (klass_index == 0) { |
208 return handler_bci; | |
209 } else if (ex_klass.is_null()) { | |
210 return handler_bci; | |
211 } else { | |
212 // we know the exception class => get the constraint class | |
213 // this may require loading of the constraint class; if verification | |
214 // fails or some other exception occurs, return handler_bci | |
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215 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); |
0 | 216 KlassHandle klass = KlassHandle(THREAD, k); |
217 assert(klass.not_null(), "klass not loaded"); | |
218 if (ex_klass->is_subtype_of(klass())) { | |
219 return handler_bci; | |
220 } | |
221 } | |
222 } | |
223 } | |
224 | |
225 return -1; | |
226 } | |
227 | |
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228 void Method::mask_for(int bci, InterpreterOopMap* mask) { |
0 | 229 |
230 Thread* myThread = Thread::current(); | |
231 methodHandle h_this(myThread, this); | |
232 #ifdef ASSERT | |
233 bool has_capability = myThread->is_VM_thread() || | |
234 myThread->is_ConcurrentGC_thread() || | |
235 myThread->is_GC_task_thread(); | |
236 | |
237 if (!has_capability) { | |
238 if (!VerifyStack && !VerifyLastFrame) { | |
239 // verify stack calls this outside VM thread | |
240 warning("oopmap should only be accessed by the " | |
241 "VM, GC task or CMS threads (or during debugging)"); | |
242 InterpreterOopMap local_mask; | |
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243 InstanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask); |
0 | 244 local_mask.print(); |
245 } | |
246 } | |
247 #endif | |
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248 InstanceKlass::cast(method_holder())->mask_for(h_this, bci, mask); |
0 | 249 return; |
250 } | |
251 | |
252 | |
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253 int Method::bci_from(address bcp) const { |
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254 #ifdef ASSERT |
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255 { ResourceMark rm; |
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256 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), |
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257 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); |
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258 } |
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259 #endif |
0 | 260 return bcp - code_base(); |
261 } | |
262 | |
263 | |
264 // Return (int)bcx if it appears to be a valid BCI. | |
265 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
266 // Return -1 otherwise. | |
267 // Used by profiling code, when invalid data is a possibility. | |
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268 // The caller is responsible for validating the Method* itself. |
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269 int Method::validate_bci_from_bcx(intptr_t bcx) const { |
0 | 270 // keep bci as -1 if not a valid bci |
271 int bci = -1; | |
272 if (bcx == 0 || (address)bcx == code_base()) { | |
273 // code_size() may return 0 and we allow 0 here | |
274 // the method may be native | |
275 bci = 0; | |
276 } else if (frame::is_bci(bcx)) { | |
277 if (bcx < code_size()) { | |
278 bci = (int)bcx; | |
279 } | |
280 } else if (contains((address)bcx)) { | |
281 bci = (address)bcx - code_base(); | |
282 } | |
283 // Assert that if we have dodged any asserts, bci is negative. | |
284 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
285 return bci; | |
286 } | |
287 | |
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288 address Method::bcp_from(int bci) const { |
0 | 289 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); |
290 address bcp = code_base() + bci; | |
291 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
292 return bcp; | |
293 } | |
294 | |
295 | |
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296 int Method::size(bool is_native) { |
0 | 297 // If native, then include pointers for native_function and signature_handler |
298 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
299 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
300 return align_object_size(header_size() + extra_words); | |
301 } | |
302 | |
303 | |
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304 Symbol* Method::klass_name() const { |
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305 Klass* k = method_holder(); |
0 | 306 assert(k->is_klass(), "must be klass"); |
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307 InstanceKlass* ik = (InstanceKlass*) k; |
0 | 308 return ik->name(); |
309 } | |
310 | |
311 | |
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312 void Method::set_interpreter_kind() { |
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313 int kind = Interpreter::method_kind(this); |
0 | 314 assert(kind != Interpreter::invalid, |
315 "interpreter entry must be valid"); | |
316 set_interpreter_kind(kind); | |
317 } | |
318 | |
319 | |
320 // Attempt to return method oop to original state. Clear any pointers | |
321 // (to objects outside the shared spaces). We won't be able to predict | |
322 // where they should point in a new JVM. Further initialize some | |
323 // entries now in order allow them to be write protected later. | |
324 | |
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325 void Method::remove_unshareable_info() { |
0 | 326 unlink_method(); |
327 set_interpreter_kind(); | |
328 } | |
329 | |
330 | |
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331 bool Method::was_executed_more_than(int n) { |
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332 // Invocation counter is reset when the Method* is compiled. |
0 | 333 // If the method has compiled code we therefore assume it has |
334 // be excuted more than n times. | |
335 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
336 // interpreter doesn't bump invocation counter of trivial methods | |
337 // compiler does not bump invocation counter of compiled methods | |
338 return true; | |
1783 | 339 } |
340 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { | |
0 | 341 // The carry bit is set when the counter overflows and causes |
342 // a compilation to occur. We don't know how many times | |
343 // the counter has been reset, so we simply assume it has | |
344 // been executed more than n times. | |
345 return true; | |
346 } else { | |
347 return invocation_count() > n; | |
348 } | |
349 } | |
350 | |
351 #ifndef PRODUCT | |
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352 void Method::print_invocation_count() { |
0 | 353 if (is_static()) tty->print("static "); |
354 if (is_final()) tty->print("final "); | |
355 if (is_synchronized()) tty->print("synchronized "); | |
356 if (is_native()) tty->print("native "); | |
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357 method_holder()->name()->print_symbol_on(tty); |
0 | 358 tty->print("."); |
359 name()->print_symbol_on(tty); | |
360 signature()->print_symbol_on(tty); | |
361 | |
362 if (WizardMode) { | |
363 // dump the size of the byte codes | |
364 tty->print(" {%d}", code_size()); | |
365 } | |
366 tty->cr(); | |
367 | |
368 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
369 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
370 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
371 if (CountCompiledCalls) { | |
372 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
373 } | |
374 | |
375 } | |
376 #endif | |
377 | |
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378 // Build a MethodData* object to hold information about this method |
0 | 379 // collected in the interpreter. |
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380 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { |
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381 // Do not profile method if current thread holds the pending list lock, |
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382 // which avoids deadlock for acquiring the MethodData_lock. |
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383 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { |
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384 return; |
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385 } |
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386 |
0 | 387 // Grab a lock here to prevent multiple |
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388 // MethodData*s from being created. |
0 | 389 MutexLocker ml(MethodData_lock, THREAD); |
390 if (method->method_data() == NULL) { | |
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391 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); |
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392 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); |
0 | 393 method->set_method_data(method_data); |
394 if (PrintMethodData && (Verbose || WizardMode)) { | |
395 ResourceMark rm(THREAD); | |
396 tty->print("build_interpreter_method_data for "); | |
397 method->print_name(tty); | |
398 tty->cr(); | |
399 // At the end of the run, the MDO, full of data, will be dumped. | |
400 } | |
401 } | |
402 } | |
403 | |
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404 void Method::cleanup_inline_caches() { |
0 | 405 // The current system doesn't use inline caches in the interpreter |
406 // => nothing to do (keep this method around for future use) | |
407 } | |
408 | |
409 | |
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410 int Method::extra_stack_words() { |
710 | 411 // not an inline function, to avoid a header dependency on Interpreter |
1506 | 412 return extra_stack_entries() * Interpreter::stackElementSize; |
710 | 413 } |
414 | |
415 | |
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416 void Method::compute_size_of_parameters(Thread *thread) { |
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417 ArgumentSizeComputer asc(signature()); |
0 | 418 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); |
419 } | |
420 | |
421 #ifdef CC_INTERP | |
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422 void Method::set_result_index(BasicType type) { |
0 | 423 _result_index = Interpreter::BasicType_as_index(type); |
424 } | |
425 #endif | |
426 | |
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427 BasicType Method::result_type() const { |
0 | 428 ResultTypeFinder rtf(signature()); |
429 return rtf.type(); | |
430 } | |
431 | |
432 | |
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433 bool Method::is_empty_method() const { |
0 | 434 return code_size() == 1 |
435 && *code_base() == Bytecodes::_return; | |
436 } | |
437 | |
438 | |
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439 bool Method::is_vanilla_constructor() const { |
0 | 440 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method |
441 // which only calls the superclass vanilla constructor and possibly does stores of | |
442 // zero constants to local fields: | |
443 // | |
444 // aload_0 | |
445 // invokespecial | |
446 // indexbyte1 | |
447 // indexbyte2 | |
448 // | |
449 // followed by an (optional) sequence of: | |
450 // | |
451 // aload_0 | |
452 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
453 // putfield | |
454 // indexbyte1 | |
455 // indexbyte2 | |
456 // | |
457 // followed by: | |
458 // | |
459 // return | |
460 | |
461 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
462 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
463 int size = code_size(); | |
464 // Check if size match | |
465 if (size == 0 || size % 5 != 0) return false; | |
466 address cb = code_base(); | |
467 int last = size - 1; | |
468 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
469 // Does not call superclass default constructor | |
470 return false; | |
471 } | |
472 // Check optional sequence | |
473 for (int i = 4; i < last; i += 5) { | |
474 if (cb[i] != Bytecodes::_aload_0) return false; | |
475 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
476 if (cb[i+2] != Bytecodes::_putfield) return false; | |
477 } | |
478 return true; | |
479 } | |
480 | |
481 | |
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482 bool Method::compute_has_loops_flag() { |
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483 BytecodeStream bcs(this); |
0 | 484 Bytecodes::Code bc; |
485 | |
486 while ((bc = bcs.next()) >= 0) { | |
487 switch( bc ) { | |
488 case Bytecodes::_ifeq: | |
489 case Bytecodes::_ifnull: | |
490 case Bytecodes::_iflt: | |
491 case Bytecodes::_ifle: | |
492 case Bytecodes::_ifne: | |
493 case Bytecodes::_ifnonnull: | |
494 case Bytecodes::_ifgt: | |
495 case Bytecodes::_ifge: | |
496 case Bytecodes::_if_icmpeq: | |
497 case Bytecodes::_if_icmpne: | |
498 case Bytecodes::_if_icmplt: | |
499 case Bytecodes::_if_icmpgt: | |
500 case Bytecodes::_if_icmple: | |
501 case Bytecodes::_if_icmpge: | |
502 case Bytecodes::_if_acmpeq: | |
503 case Bytecodes::_if_acmpne: | |
504 case Bytecodes::_goto: | |
505 case Bytecodes::_jsr: | |
506 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
507 break; | |
508 | |
509 case Bytecodes::_goto_w: | |
510 case Bytecodes::_jsr_w: | |
511 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
512 break; | |
513 } | |
514 } | |
515 _access_flags.set_loops_flag_init(); | |
516 return _access_flags.has_loops(); | |
517 } | |
518 | |
519 | |
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520 bool Method::is_final_method() const { |
0 | 521 // %%% Should return true for private methods also, |
522 // since there is no way to override them. | |
523 return is_final() || Klass::cast(method_holder())->is_final(); | |
524 } | |
525 | |
526 | |
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527 bool Method::is_strict_method() const { |
0 | 528 return is_strict(); |
529 } | |
530 | |
531 | |
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532 bool Method::can_be_statically_bound() const { |
0 | 533 if (is_final_method()) return true; |
534 return vtable_index() == nonvirtual_vtable_index; | |
535 } | |
536 | |
537 | |
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538 bool Method::is_accessor() const { |
0 | 539 if (code_size() != 5) return false; |
540 if (size_of_parameters() != 1) return false; | |
2142 | 541 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; |
542 if (java_code_at(1) != Bytecodes::_getfield) return false; | |
543 if (java_code_at(4) != Bytecodes::_areturn && | |
544 java_code_at(4) != Bytecodes::_ireturn ) return false; | |
0 | 545 return true; |
546 } | |
547 | |
548 | |
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549 bool Method::is_initializer() const { |
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550 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); |
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551 } |
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552 |
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553 bool Method::has_valid_initializer_flags() const { |
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554 return (is_static() || |
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555 InstanceKlass::cast(method_holder())->major_version() < 51); |
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556 } |
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557 |
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558 bool Method::is_static_initializer() const { |
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559 // For classfiles version 51 or greater, ensure that the clinit method is |
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560 // static. Non-static methods with the name "<clinit>" are not static |
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561 // initializers. (older classfiles exempted for backward compatibility) |
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562 return name() == vmSymbols::class_initializer_name() && |
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563 has_valid_initializer_flags(); |
0 | 564 } |
565 | |
566 | |
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567 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { |
0 | 568 int length = this_oop->checked_exceptions_length(); |
569 if (length == 0) { // common case | |
570 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
571 } else { | |
572 methodHandle h_this(THREAD, this_oop); | |
1142 | 573 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); |
0 | 574 objArrayHandle mirrors (THREAD, m_oop); |
575 for (int i = 0; i < length; i++) { | |
576 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
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577 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); |
1142 | 578 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); |
0 | 579 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror()); |
580 } | |
581 return mirrors; | |
582 } | |
583 }; | |
584 | |
585 | |
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586 int Method::line_number_from_bci(int bci) const { |
0 | 587 if (bci == SynchronizationEntryBCI) bci = 0; |
588 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
589 int best_bci = 0; | |
590 int best_line = -1; | |
591 | |
592 if (has_linenumber_table()) { | |
593 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
594 // Not necessarily sorted and not necessarily one-to-one. | |
595 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
596 while (stream.read_pair()) { | |
597 if (stream.bci() == bci) { | |
598 // perfect match | |
599 return stream.line(); | |
600 } else { | |
601 // update best_bci/line | |
602 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
603 best_bci = stream.bci(); | |
604 best_line = stream.line(); | |
605 } | |
606 } | |
607 } | |
608 } | |
609 return best_line; | |
610 } | |
611 | |
612 | |
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613 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { |
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614 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { |
0 | 615 Thread *thread = Thread::current(); |
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616 Symbol* klass_name = constants()->klass_name_at(klass_index); |
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617 Handle loader(thread, InstanceKlass::cast(method_holder())->class_loader()); |
0 | 618 Handle prot (thread, Klass::cast(method_holder())->protection_domain()); |
619 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; | |
620 } else { | |
621 return true; | |
622 } | |
623 } | |
624 | |
625 | |
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626 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { |
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627 int klass_index = constants()->klass_ref_index_at(refinfo_index); |
0 | 628 if (must_be_resolved) { |
629 // Make sure klass is resolved in constantpool. | |
630 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
631 } | |
632 return is_klass_loaded_by_klass_index(klass_index); | |
633 } | |
634 | |
635 | |
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636 void Method::set_native_function(address function, bool post_event_flag) { |
0 | 637 assert(function != NULL, "use clear_native_function to unregister natives"); |
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638 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); |
0 | 639 address* native_function = native_function_addr(); |
640 | |
641 // We can see racers trying to place the same native function into place. Once | |
642 // is plenty. | |
643 address current = *native_function; | |
644 if (current == function) return; | |
645 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
646 function != NULL) { | |
647 // native_method_throw_unsatisfied_link_error_entry() should only | |
648 // be passed when post_event_flag is false. | |
649 assert(function != | |
650 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
651 "post_event_flag mis-match"); | |
652 | |
653 // post the bind event, and possible change the bind function | |
654 JvmtiExport::post_native_method_bind(this, &function); | |
655 } | |
656 *native_function = function; | |
657 // This function can be called more than once. We must make sure that we always | |
658 // use the latest registered method -> check if a stub already has been generated. | |
659 // If so, we have to make it not_entrant. | |
660 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
661 if (nm != NULL) { | |
662 nm->make_not_entrant(); | |
663 } | |
664 } | |
665 | |
666 | |
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667 bool Method::has_native_function() const { |
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668 if (is_method_handle_intrinsic()) |
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669 return false; // special-cased in SharedRuntime::generate_native_wrapper |
0 | 670 address func = native_function(); |
671 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
672 } | |
673 | |
674 | |
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675 void Method::clear_native_function() { |
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676 // Note: is_method_handle_intrinsic() is allowed here. |
0 | 677 set_native_function( |
678 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
679 !native_bind_event_is_interesting); | |
680 clear_code(); | |
681 } | |
682 | |
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683 address Method::critical_native_function() { |
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684 methodHandle mh(this); |
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685 return NativeLookup::lookup_critical_entry(mh); |
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686 } |
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687 |
0 | 688 |
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689 void Method::set_signature_handler(address handler) { |
0 | 690 address* signature_handler = signature_handler_addr(); |
691 *signature_handler = handler; | |
692 } | |
693 | |
694 | |
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695 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report) { |
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696 if (PrintCompilation && report) { |
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697 ttyLocker ttyl; |
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698 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); |
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699 if (comp_level == CompLevel_all) { |
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700 tty->print("all levels "); |
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701 } else { |
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702 tty->print("levels "); |
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703 for (int i = (int)CompLevel_none; i <= comp_level; i++) { |
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704 tty->print("%d ", i); |
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705 } |
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706 } |
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707 this->print_short_name(tty); |
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708 int size = this->code_size(); |
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709 if (size > 0) |
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710 tty->print(" (%d bytes)", size); |
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711 tty->cr(); |
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712 } |
0 | 713 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { |
714 ttyLocker ttyl; | |
6843 | 715 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", |
716 is_osr ? "osr_" : "", os::current_thread_id()); | |
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717 xtty->method(this); |
0 | 718 xtty->stamp(); |
719 xtty->end_elem(); | |
720 } | |
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721 } |
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722 |
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723 bool Method::is_not_compilable(int comp_level) const { |
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724 if (number_of_breakpoints() > 0) |
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725 return true; |
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726 if (is_method_handle_intrinsic()) |
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727 return !is_synthetic(); // the generated adapters must be compiled |
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728 if (comp_level == CompLevel_any) |
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729 return is_not_c1_compilable() || is_not_c2_compilable(); |
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730 if (is_c1_compile(comp_level)) |
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731 return is_not_c1_compilable(); |
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732 if (is_c2_compile(comp_level)) |
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733 return is_not_c2_compilable(); |
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734 return false; |
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735 } |
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736 |
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737 // call this when compiler finds that this method is not compilable |
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738 void Method::set_not_compilable(int comp_level, bool report) { |
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739 print_made_not_compilable(comp_level, /*is_osr*/ false, report); |
1783 | 740 if (comp_level == CompLevel_all) { |
741 set_not_c1_compilable(); | |
742 set_not_c2_compilable(); | |
743 } else { | |
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744 if (is_c1_compile(comp_level)) |
1783 | 745 set_not_c1_compilable(); |
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746 if (is_c2_compile(comp_level)) |
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747 set_not_c2_compilable(); |
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748 } |
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749 CompilationPolicy::policy()->disable_compilation(this); |
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750 } |
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751 |
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752 bool Method::is_not_osr_compilable(int comp_level) const { |
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753 if (is_not_compilable(comp_level)) |
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754 return true; |
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755 if (comp_level == CompLevel_any) |
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756 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); |
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757 if (is_c1_compile(comp_level)) |
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758 return is_not_c1_osr_compilable(); |
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759 if (is_c2_compile(comp_level)) |
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760 return is_not_c2_osr_compilable(); |
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761 return false; |
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762 } |
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763 |
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764 void Method::set_not_osr_compilable(int comp_level, bool report) { |
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765 print_made_not_compilable(comp_level, /*is_osr*/ true, report); |
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766 if (comp_level == CompLevel_all) { |
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767 set_not_c1_osr_compilable(); |
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768 set_not_c2_osr_compilable(); |
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769 } else { |
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770 if (is_c1_compile(comp_level)) |
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771 set_not_c1_osr_compilable(); |
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772 if (is_c2_compile(comp_level)) |
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773 set_not_c2_osr_compilable(); |
0 | 774 } |
1783 | 775 CompilationPolicy::policy()->disable_compilation(this); |
0 | 776 } |
777 | |
778 // Revert to using the interpreter and clear out the nmethod | |
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779 void Method::clear_code() { |
0 | 780 |
781 // this may be NULL if c2i adapters have not been made yet | |
782 // Only should happen at allocate time. | |
783 if (_adapter == NULL) { | |
784 _from_compiled_entry = NULL; | |
785 } else { | |
786 _from_compiled_entry = _adapter->get_c2i_entry(); | |
787 } | |
788 OrderAccess::storestore(); | |
789 _from_interpreted_entry = _i2i_entry; | |
790 OrderAccess::storestore(); | |
791 _code = NULL; | |
792 } | |
793 | |
794 // Called by class data sharing to remove any entry points (which are not shared) | |
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795 void Method::unlink_method() { |
0 | 796 _code = NULL; |
797 _i2i_entry = NULL; | |
798 _from_interpreted_entry = NULL; | |
799 if (is_native()) { | |
800 *native_function_addr() = NULL; | |
801 set_signature_handler(NULL); | |
802 } | |
803 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
804 invocation_counter()->reset(); | |
805 backedge_counter()->reset(); | |
806 _adapter = NULL; | |
807 _from_compiled_entry = NULL; | |
808 assert(_method_data == NULL, "unexpected method data?"); | |
809 set_method_data(NULL); | |
810 set_interpreter_throwout_count(0); | |
811 set_interpreter_invocation_count(0); | |
812 } | |
813 | |
814 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
815 // is ready to be called from interpreter, compiler, and vtables. | |
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816 void Method::link_method(methodHandle h_method, TRAPS) { |
3748 | 817 // If the code cache is full, we may reenter this function for the |
818 // leftover methods that weren't linked. | |
819 if (_i2i_entry != NULL) return; | |
820 | |
0 | 821 assert(_adapter == NULL, "init'd to NULL" ); |
822 assert( _code == NULL, "nothing compiled yet" ); | |
823 | |
824 // Setup interpreter entrypoint | |
825 assert(this == h_method(), "wrong h_method()" ); | |
826 address entry = Interpreter::entry_for_method(h_method); | |
827 assert(entry != NULL, "interpreter entry must be non-null"); | |
828 // Sets both _i2i_entry and _from_interpreted_entry | |
829 set_interpreter_entry(entry); | |
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830 if (is_native() && !is_method_handle_intrinsic()) { |
0 | 831 set_native_function( |
832 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
833 !native_bind_event_is_interesting); | |
834 } | |
835 | |
836 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
837 // special handling of vtables. An alternative is to make adapters more | |
838 // lazily by calling make_adapter() from from_compiled_entry() for the | |
839 // normal calls. For vtable calls life gets more complicated. When a | |
840 // call-site goes mega-morphic we need adapters in all methods which can be | |
841 // called from the vtable. We need adapters on such methods that get loaded | |
842 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
843 // problem we'll make these lazily later. | |
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844 (void) make_adapters(h_method, CHECK); |
0 | 845 |
846 // ONLY USE the h_method now as make_adapter may have blocked | |
847 | |
848 } | |
849 | |
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850 address Method::make_adapters(methodHandle mh, TRAPS) { |
0 | 851 // Adapters for compiled code are made eagerly here. They are fairly |
852 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
853 // so making them eagerly shouldn't be too expensive. | |
854 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
855 if (adapter == NULL ) { | |
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856 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); |
0 | 857 } |
858 | |
859 mh->set_adapter_entry(adapter); | |
860 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
861 return adapter->get_c2i_entry(); | |
862 } | |
863 | |
864 // The verified_code_entry() must be called when a invoke is resolved | |
865 // on this method. | |
866 | |
867 // It returns the compiled code entry point, after asserting not null. | |
868 // This function is called after potential safepoints so that nmethod | |
869 // or adapter that it points to is still live and valid. | |
870 // This function must not hit a safepoint! | |
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871 address Method::verified_code_entry() { |
0 | 872 debug_only(No_Safepoint_Verifier nsv;) |
1202 | 873 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); |
874 if (code == NULL && UseCodeCacheFlushing) { | |
875 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); | |
876 if (saved_code != NULL) { | |
877 methodHandle method(this); | |
878 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); | |
879 set_code( method, saved_code ); | |
880 } | |
881 } | |
882 | |
0 | 883 assert(_from_compiled_entry != NULL, "must be set"); |
884 return _from_compiled_entry; | |
885 } | |
886 | |
887 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
888 // (could be racing a deopt). | |
889 // Not inline to avoid circular ref. | |
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890 bool Method::check_code() const { |
0 | 891 // cached in a register or local. There's a race on the value of the field. |
892 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
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893 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); |
0 | 894 } |
895 | |
896 // Install compiled code. Instantly it can execute. | |
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897 void Method::set_code(methodHandle mh, nmethod *code) { |
0 | 898 assert( code, "use clear_code to remove code" ); |
899 assert( mh->check_code(), "" ); | |
900 | |
901 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
902 | |
903 // These writes must happen in this order, because the interpreter will | |
904 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
905 // which jumps to _from_compiled_entry. | |
906 mh->_code = code; // Assign before allowing compiled code to exec | |
907 | |
908 int comp_level = code->comp_level(); | |
909 // In theory there could be a race here. In practice it is unlikely | |
910 // and not worth worrying about. | |
1783 | 911 if (comp_level > mh->highest_comp_level()) { |
912 mh->set_highest_comp_level(comp_level); | |
0 | 913 } |
914 | |
915 OrderAccess::storestore(); | |
1692 | 916 #ifdef SHARK |
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917 mh->_from_interpreted_entry = code->insts_begin(); |
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918 #else //!SHARK |
0 | 919 mh->_from_compiled_entry = code->verified_entry_point(); |
920 OrderAccess::storestore(); | |
921 // Instantly compiled code can execute. | |
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922 if (!mh->is_method_handle_intrinsic()) |
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923 mh->_from_interpreted_entry = mh->get_i2c_entry(); |
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924 #endif //!SHARK |
0 | 925 } |
926 | |
927 | |
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928 bool Method::is_overridden_in(Klass* k) const { |
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929 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 930 |
931 if (ik->is_interface()) return false; | |
932 | |
933 // If method is an interface, we skip it - except if it | |
934 // is a miranda method | |
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935 if (InstanceKlass::cast(method_holder())->is_interface()) { |
0 | 936 // Check that method is not a miranda method |
937 if (ik->lookup_method(name(), signature()) == NULL) { | |
938 // No implementation exist - so miranda method | |
939 return false; | |
940 } | |
941 return true; | |
942 } | |
943 | |
944 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
945 assert(ik->vtable() != NULL, "vtable should exist"); | |
946 if (vtable_index() == nonvirtual_vtable_index) { | |
947 return false; | |
948 } else { | |
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949 Method* vt_m = ik->method_at_vtable(vtable_index()); |
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950 return vt_m != this; |
0 | 951 } |
952 } | |
953 | |
954 | |
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955 // give advice about whether this Method* should be cached or not |
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956 bool Method::should_not_be_cached() const { |
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957 if (is_old()) { |
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958 // This method has been redefined. It is either EMCP or obsolete |
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959 // and we don't want to cache it because that would pin the method |
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960 // down and prevent it from being collectible if and when it |
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961 // finishes executing. |
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962 return true; |
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963 } |
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964 |
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965 // caching this method should be just fine |
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966 return false; |
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967 } |
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968 |
710 | 969 // Constant pool structure for invoke methods: |
970 enum { | |
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971 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. |
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972 _imcp_invoke_signature, // utf8: (variable Symbol*) |
710 | 973 _imcp_limit |
974 }; | |
975 | |
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976 // Test if this method is an MH adapter frame generated by Java code. |
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977 // Cf. java/lang/invoke/InvokerBytecodeGenerator |
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978 bool Method::is_compiled_lambda_form() const { |
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979 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; |
710 | 980 } |
981 | |
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982 // Test if this method is an internal MH primitive method. |
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983 bool Method::is_method_handle_intrinsic() const { |
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984 vmIntrinsics::ID iid = intrinsic_id(); |
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985 return (MethodHandles::is_signature_polymorphic(iid) && |
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986 MethodHandles::is_signature_polymorphic_intrinsic(iid)); |
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987 } |
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988 |
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989 bool Method::has_member_arg() const { |
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990 vmIntrinsics::ID iid = intrinsic_id(); |
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991 return (MethodHandles::is_signature_polymorphic(iid) && |
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992 MethodHandles::has_member_arg(iid)); |
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993 } |
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994 |
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995 // Make an instance of a signature-polymorphic internal MH primitive. |
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996 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, |
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997 Symbol* signature, |
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998 TRAPS) { |
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999 ResourceMark rm; |
710 | 1000 methodHandle empty; |
1001 | |
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1002 KlassHandle holder = SystemDictionary::MethodHandle_klass(); |
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1003 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); |
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1004 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); |
710 | 1005 if (TraceMethodHandles) { |
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1006 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); |
710 | 1007 } |
1008 | |
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1009 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) |
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1010 name->increment_refcount(); |
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1011 signature->increment_refcount(); |
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1012 |
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1013 int cp_length = _imcp_limit; |
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1014 ClassLoaderData* loader_data = holder->class_loader_data(); |
710 | 1015 constantPoolHandle cp; |
1016 { | |
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1017 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); |
710 | 1018 cp = constantPoolHandle(THREAD, cp_oop); |
1019 } | |
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1020 cp->set_pool_holder(holder()); |
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1021 cp->symbol_at_put(_imcp_invoke_name, name); |
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1022 cp->symbol_at_put(_imcp_invoke_signature, signature); |
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1023 cp->set_preresolution(); |
710 | 1024 |
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1025 // decide on access bits: public or not? |
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1026 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); |
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1027 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); |
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1028 if (must_be_static) flags_bits |= JVM_ACC_STATIC; |
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1029 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); |
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1030 |
710 | 1031 methodHandle m; |
1032 { | |
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1033 Method* m_oop = Method::allocate(loader_data, 0, accessFlags_from(flags_bits), |
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1034 0, 0, 0, 0, CHECK_(empty)); |
710 | 1035 m = methodHandle(THREAD, m_oop); |
1036 } | |
1037 m->set_constants(cp()); | |
1038 m->set_name_index(_imcp_invoke_name); | |
1039 m->set_signature_index(_imcp_invoke_signature); | |
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1040 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); |
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1041 assert(m->signature() == signature, ""); |
710 | 1042 #ifdef CC_INTERP |
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1043 ResultTypeFinder rtf(signature); |
710 | 1044 m->set_result_index(rtf.type()); |
1045 #endif | |
1046 m->compute_size_of_parameters(THREAD); | |
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1047 m->init_intrinsic_id(); |
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1048 assert(m->is_method_handle_intrinsic(), ""); |
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1049 #ifdef ASSERT |
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1050 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); |
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1051 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); |
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1052 assert(m->intrinsic_id() == iid, "correctly predicted iid"); |
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1053 #endif //ASSERT |
710 | 1054 |
1055 // Finally, set up its entry points. | |
1056 assert(m->can_be_statically_bound(), ""); | |
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1057 m->set_vtable_index(Method::nonvirtual_vtable_index); |
710 | 1058 m->link_method(m, CHECK_(empty)); |
1059 | |
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1060 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 1061 m->print_on(tty); |
1062 | |
1063 return m; | |
1064 } | |
1065 | |
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1066 Klass* Method::check_non_bcp_klass(Klass* klass) { |
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1067 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) { |
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1068 if (Klass::cast(klass)->oop_is_objArray()) |
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1069 klass = ObjArrayKlass::cast(klass)->bottom_klass(); |
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1070 return klass; |
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1071 } |
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1072 return NULL; |
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1073 } |
710 | 1074 |
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1075 |
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1076 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
0 | 1077 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { |
1078 // Code below does not work for native methods - they should never get rewritten anyway | |
1079 assert(!m->is_native(), "cannot rewrite native methods"); | |
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1080 // Allocate new Method* |
0 | 1081 AccessFlags flags = m->access_flags(); |
1082 int checked_exceptions_len = m->checked_exceptions_length(); | |
1083 int localvariable_len = m->localvariable_table_length(); | |
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1084 int exception_table_len = m->exception_table_length(); |
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1085 |
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1086 ClassLoaderData* loader_data = m()->method_holder()->class_loader_data(); |
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1087 Method* newm_oop = Method::allocate(loader_data, |
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1088 new_code_length, |
518
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1089 flags, |
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1090 new_compressed_linenumber_size, |
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1091 localvariable_len, |
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1092 exception_table_len, |
518
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1093 checked_exceptions_len, |
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1094 CHECK_(methodHandle())); |
0 | 1095 methodHandle newm (THREAD, newm_oop); |
1096 int new_method_size = newm->method_size(); | |
518
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1097 |
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1098 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* |
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1099 ConstMethod* newcm = newm->constMethod(); |
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1100 int new_const_method_size = newm->constMethod()->size(); |
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1101 |
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1102 memcpy(newm(), m(), sizeof(Method)); |
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1103 |
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1104 // Create shallow copy of ConstMethod. |
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1105 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); |
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1106 |
0 | 1107 // Reset correct method/const method, method size, and parameter info |
1108 newm->set_constMethod(newcm); | |
1109 newm->constMethod()->set_code_size(new_code_length); | |
1110 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
1111 newm->set_method_size(new_method_size); | |
1112 assert(newm->code_size() == new_code_length, "check"); | |
1113 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
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1114 assert(newm->exception_table_length() == exception_table_len, "check"); |
0 | 1115 assert(newm->localvariable_table_length() == localvariable_len, "check"); |
1116 // Copy new byte codes | |
1117 memcpy(newm->code_base(), new_code, new_code_length); | |
1118 // Copy line number table | |
1119 if (new_compressed_linenumber_size > 0) { | |
1120 memcpy(newm->compressed_linenumber_table(), | |
1121 new_compressed_linenumber_table, | |
1122 new_compressed_linenumber_size); | |
1123 } | |
1124 // Copy checked_exceptions | |
1125 if (checked_exceptions_len > 0) { | |
1126 memcpy(newm->checked_exceptions_start(), | |
1127 m->checked_exceptions_start(), | |
1128 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
1129 } | |
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1130 // Copy exception table |
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1131 if (exception_table_len > 0) { |
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1132 memcpy(newm->exception_table_start(), |
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1133 m->exception_table_start(), |
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1134 exception_table_len * sizeof(ExceptionTableElement)); |
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1135 } |
0 | 1136 // Copy local variable number table |
1137 if (localvariable_len > 0) { | |
1138 memcpy(newm->localvariable_table_start(), | |
1139 m->localvariable_table_start(), | |
1140 localvariable_len * sizeof(LocalVariableTableElement)); | |
1141 } | |
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1142 // Copy stackmap table |
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1143 if (m->has_stackmap_table()) { |
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1144 int code_attribute_length = m->stackmap_data()->length(); |
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1145 Array<u1>* stackmap_data = |
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1146 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); |
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1147 memcpy((void*)stackmap_data->adr_at(0), |
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1148 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); |
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1149 newm->set_stackmap_data(stackmap_data); |
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1150 } |
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1151 |
0 | 1152 return newm; |
1153 } | |
1154 | |
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1155 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { |
0 | 1156 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
1157 // because we are not loading from core libraries | |
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1158 if (InstanceKlass::cast(holder)->class_loader() != NULL) |
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1159 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
0 | 1160 |
1161 // see if the klass name is well-known: | |
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1162 Symbol* klass_name = InstanceKlass::cast(holder)->name(); |
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1163 return vmSymbols::find_sid(klass_name); |
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1164 } |
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1165 |
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1166 void Method::init_intrinsic_id() { |
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1167 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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1168 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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1169 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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1170 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); |
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1171 |
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1172 // the klass name is well-known: |
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1173 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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1174 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 1175 |
1176 // ditto for method and signature: | |
1177 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
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1178 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1179 && name_id == vmSymbols::NO_SID) |
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1180 return; |
0 | 1181 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
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1182 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1183 && sig_id == vmSymbols::NO_SID) return; |
0 | 1184 jshort flags = access_flags().as_short(); |
1185 | |
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1186 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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1187 if (id != vmIntrinsics::_none) { |
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1188 set_intrinsic_id(id); |
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1189 return; |
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1190 } |
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1191 |
0 | 1192 // A few slightly irregular cases: |
1193 switch (klass_id) { | |
1194 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1195 // Second chance: check in regular Math. | |
1196 switch (name_id) { | |
1197 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1198 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1199 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1200 // pretend it is the corresponding method in the non-strict class: | |
1201 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
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1202 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1203 break; |
1204 } | |
1507
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1205 break; |
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1206 |
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1207 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. |
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1208 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): |
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1209 if (!is_native()) break; |
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1210 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); |
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1211 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) |
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1212 id = vmIntrinsics::_none; |
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1213 break; |
0 | 1214 } |
1215 | |
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1216 if (id != vmIntrinsics::_none) { |
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1217 // Set up its iid. It is an alias method. |
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1218 set_intrinsic_id(id); |
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1219 return; |
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1220 } |
0 | 1221 } |
1222 | |
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1223 // These two methods are static since a GC may move the Method |
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1224 bool Method::load_signature_classes(methodHandle m, TRAPS) { |
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1225 if (THREAD->is_Compiler_thread()) { |
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1226 // There is nothing useful this routine can do from within the Compile thread. |
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1227 // Hopefully, the signature contains only well-known classes. |
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1228 // We could scan for this and return true/false, but the caller won't care. |
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1229 return false; |
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1230 } |
0 | 1231 bool sig_is_loaded = true; |
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1232 Handle class_loader(THREAD, InstanceKlass::cast(m->method_holder())->class_loader()); |
0 | 1233 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); |
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1234 ResourceMark rm(THREAD); |
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1235 Symbol* signature = m->signature(); |
0 | 1236 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1237 if (ss.is_object()) { | |
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1238 Symbol* sym = ss.as_symbol(CHECK_(false)); |
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1239 Symbol* name = sym; |
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1240 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, |
0 | 1241 protection_domain, THREAD); |
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1242 // We are loading classes eagerly. If a ClassNotFoundException or |
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1243 // a LinkageError was generated, be sure to ignore it. |
0 | 1244 if (HAS_PENDING_EXCEPTION) { |
1142 | 1245 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || |
1246 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { | |
0 | 1247 CLEAR_PENDING_EXCEPTION; |
1248 } else { | |
1249 return false; | |
1250 } | |
1251 } | |
1252 if( klass == NULL) { sig_is_loaded = false; } | |
1253 } | |
1254 } | |
1255 return sig_is_loaded; | |
1256 } | |
1257 | |
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1258 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { |
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1259 Handle class_loader(THREAD, InstanceKlass::cast(m->method_holder())->class_loader()); |
0 | 1260 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); |
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1261 ResourceMark rm(THREAD); |
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1262 Symbol* signature = m->signature(); |
0 | 1263 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1264 if (ss.type() == T_OBJECT) { | |
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1265 Symbol* name = ss.as_symbol_or_null(); |
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1266 if (name == NULL) return true; |
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1267 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); |
0 | 1268 if (klass == NULL) return true; |
1269 } | |
1270 } | |
1271 return false; | |
1272 } | |
1273 | |
1274 // Exposed so field engineers can debug VM | |
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1275 void Method::print_short_name(outputStream* st) { |
0 | 1276 ResourceMark rm; |
1277 #ifdef PRODUCT | |
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1278 st->print(" %s::", method_holder()->external_name()); |
0 | 1279 #else |
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1280 st->print(" %s::", method_holder()->internal_name()); |
0 | 1281 #endif |
1282 name()->print_symbol_on(st); | |
1283 if (WizardMode) signature()->print_symbol_on(st); | |
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1284 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) |
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1285 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); |
0 | 1286 } |
1287 | |
1288 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
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1289 static void reorder_based_on_method_index(Array<Method*>* methods, |
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1290 Array<AnnotationArray*>* annotations, |
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1291 GrowableArray<AnnotationArray*>* temp_array) { |
0 | 1292 if (annotations == NULL) { |
1293 return; | |
1294 } | |
1295 | |
1296 int length = methods->length(); | |
1297 int i; | |
1298 // Copy to temp array | |
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1299 temp_array->clear(); |
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1300 for (i = 0; i < length; i++) { |
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1301 temp_array->append(annotations->at(i)); |
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1302 } |
0 | 1303 |
1304 // Copy back using old method indices | |
1305 for (i = 0; i < length; i++) { | |
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1306 Method* m = methods->at(i); |
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1307 annotations->at_put(i, temp_array->at(m->method_idnum())); |
0 | 1308 } |
1309 } | |
1310 | |
3779 | 1311 // Comparer for sorting an object array containing |
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1312 // Method*s. |
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1313 static int method_comparator(Method* a, Method* b) { |
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1314 return a->name()->fast_compare(b->name()); |
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1315 } |
0 | 1316 |
1317 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
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1318 void Method::sort_methods(Array<Method*>* methods, |
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1319 Array<AnnotationArray*>* methods_annotations, |
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1320 Array<AnnotationArray*>* methods_parameter_annotations, |
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1321 Array<AnnotationArray*>* methods_default_annotations, |
0 | 1322 bool idempotent) { |
1323 int length = methods->length(); | |
1324 if (length > 1) { | |
1325 bool do_annotations = false; | |
1326 if (methods_annotations != NULL || | |
1327 methods_parameter_annotations != NULL || | |
1328 methods_default_annotations != NULL) { | |
1329 do_annotations = true; | |
1330 } | |
1331 if (do_annotations) { | |
1332 // Remember current method ordering so we can reorder annotations | |
1333 for (int i = 0; i < length; i++) { | |
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1334 Method* m = methods->at(i); |
0 | 1335 m->set_method_idnum(i); |
1336 } | |
1337 } | |
3779 | 1338 { |
1339 No_Safepoint_Verifier nsv; | |
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1340 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); |
0 | 1341 } |
1342 | |
1343 // Sort annotations if necessary | |
1344 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); | |
1345 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); | |
1346 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); | |
1347 if (do_annotations) { | |
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1348 ResourceMark rm; |
0 | 1349 // Allocate temporary storage |
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1350 GrowableArray<AnnotationArray*>* temp_array = new GrowableArray<AnnotationArray*>(length); |
0 | 1351 reorder_based_on_method_index(methods, methods_annotations, temp_array); |
1352 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); | |
1353 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); | |
1354 } | |
1355 | |
1356 // Reset method ordering | |
1357 for (int i = 0; i < length; i++) { | |
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1358 Method* m = methods->at(i); |
0 | 1359 m->set_method_idnum(i); |
1360 } | |
1361 } | |
1362 } | |
1363 | |
1364 | |
1365 //----------------------------------------------------------------------------------- | |
1366 // Non-product code | |
1367 | |
1368 #ifndef PRODUCT | |
1369 class SignatureTypePrinter : public SignatureTypeNames { | |
1370 private: | |
1371 outputStream* _st; | |
1372 bool _use_separator; | |
1373 | |
1374 void type_name(const char* name) { | |
1375 if (_use_separator) _st->print(", "); | |
1376 _st->print(name); | |
1377 _use_separator = true; | |
1378 } | |
1379 | |
1380 public: | |
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1381 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { |
0 | 1382 _st = st; |
1383 _use_separator = false; | |
1384 } | |
1385 | |
1386 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1387 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1388 }; | |
1389 | |
1390 | |
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1391 void Method::print_name(outputStream* st) { |
0 | 1392 Thread *thread = Thread::current(); |
1393 ResourceMark rm(thread); | |
1394 SignatureTypePrinter sig(signature(), st); | |
1395 st->print("%s ", is_static() ? "static" : "virtual"); | |
1396 sig.print_returntype(); | |
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1397 st->print(" %s.", method_holder()->internal_name()); |
0 | 1398 name()->print_symbol_on(st); |
1399 st->print("("); | |
1400 sig.print_parameters(); | |
1401 st->print(")"); | |
1402 } | |
1403 | |
1404 | |
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1405 void Method::print_codes_on(outputStream* st) const { |
0 | 1406 print_codes_on(0, code_size(), st); |
1407 } | |
1408 | |
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1409 void Method::print_codes_on(int from, int to, outputStream* st) const { |
0 | 1410 Thread *thread = Thread::current(); |
1411 ResourceMark rm(thread); | |
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1412 methodHandle mh (thread, (Method*)this); |
0 | 1413 BytecodeStream s(mh); |
1414 s.set_interval(from, to); | |
1415 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
1416 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); | |
1417 } | |
1418 #endif // not PRODUCT | |
1419 | |
1420 | |
1421 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas | |
1422 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) | |
1423 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used | |
1424 // as end-of-stream terminator. | |
1425 | |
1426 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { | |
1427 // bci and line number does not compress into single byte. | |
1428 // Write out escape character and use regular compression for bci and line number. | |
1429 write_byte((jubyte)0xFF); | |
1430 write_signed_int(bci_delta); | |
1431 write_signed_int(line_delta); | |
1432 } | |
1433 | |
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1434 // See comment in method.hpp which explains why this exists. |
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1435 #if defined(_M_AMD64) && _MSC_VER >= 1400 |
0 | 1436 #pragma optimize("", off) |
1437 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { | |
1438 write_pair_inline(bci, line); | |
1439 } | |
1440 #pragma optimize("", on) | |
1441 #endif | |
1442 | |
1443 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { | |
1444 _bci = 0; | |
1445 _line = 0; | |
1446 }; | |
1447 | |
1448 | |
1449 bool CompressedLineNumberReadStream::read_pair() { | |
1450 jubyte next = read_byte(); | |
1451 // Check for terminator | |
1452 if (next == 0) return false; | |
1453 if (next == 0xFF) { | |
1454 // Escape character, regular compression used | |
1455 _bci += read_signed_int(); | |
1456 _line += read_signed_int(); | |
1457 } else { | |
1458 // Single byte compression used | |
1459 _bci += next >> 3; | |
1460 _line += next & 0x7; | |
1461 } | |
1462 return true; | |
1463 } | |
1464 | |
1465 | |
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1466 Bytecodes::Code Method::orig_bytecode_at(int bci) const { |
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1467 BreakpointInfo* bp = InstanceKlass::cast(method_holder())->breakpoints(); |
0 | 1468 for (; bp != NULL; bp = bp->next()) { |
1469 if (bp->match(this, bci)) { | |
1470 return bp->orig_bytecode(); | |
1471 } | |
1472 } | |
1473 ShouldNotReachHere(); | |
1474 return Bytecodes::_shouldnotreachhere; | |
1475 } | |
1476 | |
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1477 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { |
0 | 1478 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); |
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1479 BreakpointInfo* bp = InstanceKlass::cast(method_holder())->breakpoints(); |
0 | 1480 for (; bp != NULL; bp = bp->next()) { |
1481 if (bp->match(this, bci)) { | |
1482 bp->set_orig_bytecode(code); | |
1483 // and continue, in case there is more than one | |
1484 } | |
1485 } | |
1486 } | |
1487 | |
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1488 void Method::set_breakpoint(int bci) { |
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1489 InstanceKlass* ik = InstanceKlass::cast(method_holder()); |
0 | 1490 BreakpointInfo *bp = new BreakpointInfo(this, bci); |
1491 bp->set_next(ik->breakpoints()); | |
1492 ik->set_breakpoints(bp); | |
1493 // do this last: | |
1494 bp->set(this); | |
1495 } | |
1496 | |
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1497 static void clear_matches(Method* m, int bci) { |
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1498 InstanceKlass* ik = InstanceKlass::cast(m->method_holder()); |
0 | 1499 BreakpointInfo* prev_bp = NULL; |
1500 BreakpointInfo* next_bp; | |
1501 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { | |
1502 next_bp = bp->next(); | |
1503 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). | |
1504 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { | |
1505 // do this first: | |
1506 bp->clear(m); | |
1507 // unhook it | |
1508 if (prev_bp != NULL) | |
1509 prev_bp->set_next(next_bp); | |
1510 else | |
1511 ik->set_breakpoints(next_bp); | |
1512 delete bp; | |
1513 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods | |
1514 // at same location. So we have multiple matching (method_index and bci) | |
1515 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one | |
1516 // breakpoint for clear_breakpoint request and keep all other method versions | |
1517 // BreakpointInfo for future clear_breakpoint request. | |
1518 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) | |
1519 // which is being called when class is unloaded. We delete all the Breakpoint | |
1520 // information for all versions of method. We may not correctly restore the original | |
1521 // bytecode in all method versions, but that is ok. Because the class is being unloaded | |
1522 // so these methods won't be used anymore. | |
1523 if (bci >= 0) { | |
1524 break; | |
1525 } | |
1526 } else { | |
1527 // This one is a keeper. | |
1528 prev_bp = bp; | |
1529 } | |
1530 } | |
1531 } | |
1532 | |
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1533 void Method::clear_breakpoint(int bci) { |
0 | 1534 assert(bci >= 0, ""); |
1535 clear_matches(this, bci); | |
1536 } | |
1537 | |
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1538 void Method::clear_all_breakpoints() { |
0 | 1539 clear_matches(this, -1); |
1540 } | |
1541 | |
1542 | |
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1543 int Method::invocation_count() { |
1783 | 1544 if (TieredCompilation) { |
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1545 MethodData* const mdo = method_data(); |
1783 | 1546 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { |
1547 return InvocationCounter::count_limit; | |
1548 } else { | |
1549 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); | |
1550 } | |
1551 } else { | |
1552 return invocation_counter()->count(); | |
1553 } | |
1554 } | |
1555 | |
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1556 int Method::backedge_count() { |
1783 | 1557 if (TieredCompilation) { |
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1558 MethodData* const mdo = method_data(); |
1783 | 1559 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { |
1560 return InvocationCounter::count_limit; | |
1561 } else { | |
1562 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); | |
1563 } | |
1564 } else { | |
1565 return backedge_counter()->count(); | |
1566 } | |
1567 } | |
1568 | |
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1569 int Method::highest_comp_level() const { |
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1570 MethodData* mdo = method_data(); |
1783 | 1571 if (mdo != NULL) { |
1572 return mdo->highest_comp_level(); | |
1573 } else { | |
1574 return CompLevel_none; | |
1575 } | |
1576 } | |
1577 | |
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1578 int Method::highest_osr_comp_level() const { |
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1579 MethodData* mdo = method_data(); |
1783 | 1580 if (mdo != NULL) { |
1581 return mdo->highest_osr_comp_level(); | |
1582 } else { | |
1583 return CompLevel_none; | |
1584 } | |
1585 } | |
1586 | |
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1587 void Method::set_highest_comp_level(int level) { |
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1588 MethodData* mdo = method_data(); |
1783 | 1589 if (mdo != NULL) { |
1590 mdo->set_highest_comp_level(level); | |
1591 } | |
1592 } | |
1593 | |
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1594 void Method::set_highest_osr_comp_level(int level) { |
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1595 MethodData* mdo = method_data(); |
1783 | 1596 if (mdo != NULL) { |
1597 mdo->set_highest_osr_comp_level(level); | |
1598 } | |
1599 } | |
1600 | |
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1601 BreakpointInfo::BreakpointInfo(Method* m, int bci) { |
0 | 1602 _bci = bci; |
1603 _name_index = m->name_index(); | |
1604 _signature_index = m->signature_index(); | |
1605 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1606 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1607 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1608 _next = NULL; | |
1609 } | |
1610 | |
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1611 void BreakpointInfo::set(Method* method) { |
0 | 1612 #ifdef ASSERT |
1613 { | |
1614 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1615 if (code == Bytecodes::_breakpoint) | |
1616 code = method->orig_bytecode_at(_bci); | |
1617 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1618 } | |
1619 #endif | |
1620 *method->bcp_from(_bci) = Bytecodes::_breakpoint; | |
1621 method->incr_number_of_breakpoints(); | |
1622 SystemDictionary::notice_modification(); | |
1623 { | |
1624 // Deoptimize all dependents on this method | |
1625 Thread *thread = Thread::current(); | |
1626 HandleMark hm(thread); | |
1627 methodHandle mh(thread, method); | |
1628 Universe::flush_dependents_on_method(mh); | |
1629 } | |
1630 } | |
1631 | |
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1632 void BreakpointInfo::clear(Method* method) { |
0 | 1633 *method->bcp_from(_bci) = orig_bytecode(); |
1634 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
1635 method->decr_number_of_breakpoints(); | |
1636 } | |
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1637 |
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1638 // jmethodID handling |
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1639 |
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1640 // This is a block allocating object, sort of like JNIHandleBlock, only a |
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1641 // lot simpler. There aren't many of these, they aren't long, they are rarely |
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1642 // deleted and so we can do some suboptimal things. |
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1643 // It's allocated on the CHeap because once we allocate a jmethodID, we can |
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1644 // never get rid of it. |
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1645 // It would be nice to be able to parameterize the number of methods for |
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1646 // the null_class_loader but then we'd have to turn this and ClassLoaderData |
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1647 // into templates. |
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1648 |
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1649 // I feel like this brain dead class should exist somewhere in the STL |
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1650 |
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1651 class JNIMethodBlock : public CHeapObj<mtClass> { |
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1652 enum { number_of_methods = 8 }; |
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1653 |
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1654 Method* _methods[number_of_methods]; |
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1655 int _top; |
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1656 JNIMethodBlock* _next; |
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1657 public: |
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1658 static Method* const _free_method; |
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1659 |
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1660 JNIMethodBlock() : _next(NULL), _top(0) { |
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1661 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; |
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1662 } |
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1663 |
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1664 Method** add_method(Method* m) { |
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1665 if (_top < number_of_methods) { |
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1666 // top points to the next free entry. |
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1667 int i = _top; |
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1668 _methods[i] = m; |
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1669 _top++; |
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1670 return &_methods[i]; |
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1671 } else if (_top == number_of_methods) { |
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1672 // if the next free entry ran off the block see if there's a free entry |
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1673 for (int i = 0; i< number_of_methods; i++) { |
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1674 if (_methods[i] == _free_method) { |
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1675 _methods[i] = m; |
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1676 return &_methods[i]; |
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1677 } |
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1678 } |
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1679 // Only check each block once for frees. They're very unlikely. |
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1680 // Increment top past the end of the block. |
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1681 _top++; |
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1682 } |
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1683 // need to allocate a next block. |
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1684 if (_next == NULL) { |
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1685 _next = new JNIMethodBlock(); |
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1686 } |
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1687 return _next->add_method(m); |
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1688 } |
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1689 |
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1690 bool contains(Method** m) { |
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1691 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1692 for (int i = 0; i< number_of_methods; i++) { |
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1693 if (&(b->_methods[i]) == m) { |
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1694 return true; |
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1695 } |
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1696 } |
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1697 } |
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1698 return false; // not found |
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1699 } |
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1700 |
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1701 // Doesn't really destroy it, just marks it as free so it can be reused. |
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1702 void destroy_method(Method** m) { |
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1703 #ifdef ASSERT |
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1704 assert(contains(m), "should be a methodID"); |
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1705 #endif // ASSERT |
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1706 *m = _free_method; |
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1707 } |
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1708 |
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1709 // During class unloading the methods are cleared, which is different |
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1710 // than freed. |
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1711 void clear_all_methods() { |
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1712 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1713 for (int i = 0; i< number_of_methods; i++) { |
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1714 _methods[i] = NULL; |
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1715 } |
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1716 } |
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1717 } |
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1718 #ifndef PRODUCT |
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1719 int count_methods() { |
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1720 // count all allocated methods |
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1721 int count = 0; |
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1722 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1723 for (int i = 0; i< number_of_methods; i++) { |
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1724 if (_methods[i] != _free_method) count++; |
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1725 } |
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1726 } |
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1727 return count; |
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1728 } |
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1729 #endif // PRODUCT |
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1730 }; |
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1731 |
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1732 // Something that can't be mistaken for an address or a markOop |
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1733 Method* const JNIMethodBlock::_free_method = (Method*)55; |
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1734 |
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1735 // Add a method id to the jmethod_ids |
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1736 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { |
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1737 ClassLoaderData* cld = loader_data; |
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1738 |
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1739 if (!SafepointSynchronize::is_at_safepoint()) { |
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1740 // Have to add jmethod_ids() to class loader data thread-safely. |
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1741 // Also have to add the method to the list safely, which the cld lock |
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1742 // protects as well. |
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1743 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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1744 if (cld->jmethod_ids() == NULL) { |
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1745 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1746 } |
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1747 // jmethodID is a pointer to Method* |
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1748 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1749 } else { |
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1750 // At safepoint, we are single threaded and can set this. |
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1751 if (cld->jmethod_ids() == NULL) { |
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1752 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1753 } |
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1754 // jmethodID is a pointer to Method* |
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1755 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1756 } |
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1757 } |
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1758 |
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1759 // Mark a jmethodID as free. This is called when there is a data race in |
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1760 // InstanceKlass while creating the jmethodID cache. |
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1761 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { |
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1762 ClassLoaderData* cld = loader_data; |
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1763 Method** ptr = (Method**)m; |
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1764 assert(cld->jmethod_ids() != NULL, "should have method handles"); |
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1765 cld->jmethod_ids()->destroy_method(ptr); |
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1766 } |
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1767 |
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1768 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { |
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1769 // Can't assert the method_holder is the same because the new method has the |
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1770 // scratch method holder. |
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1771 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() |
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1772 == new_method->method_holder()->class_loader(), |
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1773 "changing to a different class loader"); |
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1774 // Just change the method in place, jmethodID pointer doesn't change. |
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1775 *((Method**)jmid) = new_method; |
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1776 } |
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1777 |
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1778 bool Method::is_method_id(jmethodID mid) { |
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1779 Method* m = resolve_jmethod_id(mid); |
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1780 assert(m != NULL, "should be called with non-null method"); |
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1781 InstanceKlass* ik = InstanceKlass::cast(m->method_holder()); |
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1782 ClassLoaderData* cld = ik->class_loader_data(); |
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1783 if (cld->jmethod_ids() == NULL) return false; |
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1784 return (cld->jmethod_ids()->contains((Method**)mid)); |
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1785 } |
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1786 |
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1787 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { |
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1788 if (mid == NULL) return NULL; |
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1789 Method* o = resolve_jmethod_id(mid); |
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1790 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { |
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1791 return NULL; |
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1792 } |
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1793 return o; |
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1794 }; |
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1795 |
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1796 void Method::set_on_stack(const bool value) { |
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1797 // Set both the method itself and its constant pool. The constant pool |
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1798 // on stack means some method referring to it is also on the stack. |
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1799 _access_flags.set_on_stack(value); |
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1800 constants()->set_on_stack(value); |
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1801 if (value) MetadataOnStackMark::record(this); |
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1802 } |
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1803 |
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1804 // Called when the class loader is unloaded to make all methods weak. |
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1805 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { |
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1806 loader_data->jmethod_ids()->clear_all_methods(); |
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1807 } |
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1808 |
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1809 #ifndef PRODUCT |
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1810 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { |
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1811 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); |
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1812 } |
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1813 #endif // PRODUCT |
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1814 |
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1815 |
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1816 // Printing |
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1817 |
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1818 #ifndef PRODUCT |
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1819 |
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1820 void Method::print_on(outputStream* st) const { |
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1821 ResourceMark rm; |
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1822 assert(is_method(), "must be method"); |
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1823 st->print_cr(internal_name()); |
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1824 // get the effect of PrintOopAddress, always, for methods: |
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1825 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); |
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1826 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); |
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1827 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); |
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1828 constants()->print_value_on(st); st->cr(); |
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1829 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); |
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1830 st->print (" - name: "); name()->print_value_on(st); st->cr(); |
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1831 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); |
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1832 st->print_cr(" - max stack: %d", max_stack()); |
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1833 st->print_cr(" - max locals: %d", max_locals()); |
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1834 st->print_cr(" - size of params: %d", size_of_parameters()); |
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1835 st->print_cr(" - method size: %d", method_size()); |
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1836 if (intrinsic_id() != vmIntrinsics::_none) |
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1837 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); |
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1838 if (highest_comp_level() != CompLevel_none) |
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1839 st->print_cr(" - highest level: %d", highest_comp_level()); |
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1840 st->print_cr(" - vtable index: %d", _vtable_index); |
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1841 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); |
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1842 st->print( " - adapters: "); |
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1843 AdapterHandlerEntry* a = ((Method*)this)->adapter(); |
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1844 if (a == NULL) |
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1845 st->print_cr(INTPTR_FORMAT, a); |
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1846 else |
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1847 a->print_adapter_on(st); |
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1848 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); |
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1849 st->print_cr(" - code size: %d", code_size()); |
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1850 if (code_size() != 0) { |
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1851 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); |
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1852 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); |
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1853 } |
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1854 if (method_data() != NULL) { |
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1855 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); |
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1856 } |
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1857 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); |
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1858 if (checked_exceptions_length() > 0) { |
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1859 CheckedExceptionElement* table = checked_exceptions_start(); |
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1860 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); |
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1861 if (Verbose) { |
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1862 for (int i = 0; i < checked_exceptions_length(); i++) { |
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1863 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); |
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1864 } |
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1865 } |
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1866 } |
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1867 if (has_linenumber_table()) { |
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1868 u_char* table = compressed_linenumber_table(); |
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1869 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); |
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1870 if (Verbose) { |
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1871 CompressedLineNumberReadStream stream(table); |
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1872 while (stream.read_pair()) { |
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1873 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); |
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1874 } |
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1875 } |
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1876 } |
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1877 st->print_cr(" - localvar length: %d", localvariable_table_length()); |
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1878 if (localvariable_table_length() > 0) { |
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1879 LocalVariableTableElement* table = localvariable_table_start(); |
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1880 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); |
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1881 if (Verbose) { |
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1882 for (int i = 0; i < localvariable_table_length(); i++) { |
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1883 int bci = table[i].start_bci; |
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1884 int len = table[i].length; |
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1885 const char* name = constants()->printable_name_at(table[i].name_cp_index); |
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1886 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); |
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1887 int slot = table[i].slot; |
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1888 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); |
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1889 } |
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1890 } |
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1891 } |
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1892 if (code() != NULL) { |
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1893 st->print (" - compiled code: "); |
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1894 code()->print_value_on(st); |
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1895 } |
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1896 if (is_native()) { |
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1897 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); |
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1898 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); |
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1899 } |
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1900 } |
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1901 |
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1902 #endif //PRODUCT |
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1903 |
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1904 void Method::print_value_on(outputStream* st) const { |
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1905 assert(is_method(), "must be method"); |
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1906 st->print_cr(internal_name()); |
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1907 print_address_on(st); |
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1908 st->print(" "); |
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1909 name()->print_value_on(st); |
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1910 st->print(" "); |
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1911 signature()->print_value_on(st); |
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1912 st->print(" in "); |
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1913 method_holder()->print_value_on(st); |
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1914 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); |
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1915 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); |
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1916 } |
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1917 |
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1918 |
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1919 // Verification |
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1920 |
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1921 void Method::verify_on(outputStream* st) { |
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1922 guarantee(is_method(), "object must be method"); |
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1923 guarantee(is_metadata(), "should be metadata"); |
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1924 guarantee(constants()->is_constantPool(), "should be constant pool"); |
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1925 guarantee(constants()->is_metadata(), "should be metadata"); |
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1926 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); |
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1927 guarantee(constMethod()->is_metadata(), "should be metadata"); |
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1928 MethodData* md = method_data(); |
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1929 guarantee(md == NULL || |
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1930 md->is_metadata(), "should be in permspace"); |
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1931 guarantee(md == NULL || |
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1932 md->is_methodData(), "should be method data"); |
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1933 } |